Unsurprisingly clay with most notable change. Becoming a significantly more aggressive surface with modern string & racquet technology. Decrease from approx 6.2 avg rally length in 1975 to approx 4.8 in 2020. Grass & hard court avg’s in 1970’s not that different to 2020. https://twitter.com/xenophar/status/1246341537753006082
Given this is match charting data this will almost certainly be skewed towards some of the big names play-styles and results. Borg may well have had a big impact on that clay lengthening in rally length for eg. & Sampras on the 90’s grass point shortening etc
Especially given smaller sample size of matches the further back you go
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